Web-tension-controlling mechanism.



I. A. HUNTING. WEB TENSION CONTROLLING MECHANISM. APPLICATION FILED D20. 7, 191 0;

Lm39144' Patented July 14,1914.

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1 1Q3 144 Patented July 14,1914,

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UNITED STATES PATENT OFFICE.

IRVING A. HUNTING, OF PLAINFIELD, NEW JERSEY, ASSIG'NOR TO WILLIS S.

01 PHILADELPHIA, PENNSYLVANIA.

MORSE,

WEB-TENSION-CONTROLLING MECHANISM.

Lioaiii.

Specification of Letters Patent.-

Patented July 14, 1914.

Application filed December 7, 1910. Serial no. 595,997.

To all 107mm it may concern:

Be it known that Plainfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Web-Tension- Controlling Mechanism, of which the following is a sp cification,

had to the accompanying drawings.

This invention relates to improvements in mechanisms for controlling the tension ofa web or continuous sheet or strip of material, such as paper or textile fabric; and an object of this invention is to provide a mechanism of the character just described which will 'be comparatively simple in construction, which may be readily applied to machines (such as printing presses) now in common use, which will be eflicient in operation and the initial cost of which will be Another object of this invention is to rovide a mechanism of this character which will quickly respond to variations in the tension of the weband in which the action of the elements will be the quicker the more the tension of the web departs from the normal tension.

A third object of this invention is to provide mechanism of this character with devices by which the retarding means may be readily moved to. ermit anew roll of material, as paper, to e put in place in the machine (for example, a printlng press).

In the drawings illustrating the principle of this invention and the best mode now known to me of applying that principle, Figure 1 is a plan of so much of a web-tension controllin mechanism as is necessary to illustrate thlsinvention; Fig. 2 is a sidev elevation of the same; Fig. 3 is a section on the line A-A of 2; Fig. 4 is a section on the line 13-13 of Fig. 2; and Fig. 5 is a section on the line OG of Fig. 3.

The upright or standard a supports one end of the roll-holding shaft 1) the other end of which is supported in an entirely similar manner by an opposite standard (not shown); and u on one end of the shaft 12 is fastened a friction wheel or pulley a; In the standard a are mounted the stud-shafts (Z, d on which are fulcrumed, respectively, the brake-levers or brake-arms e, 0 provided with the brake-shoes f. The latter normally bear upon the mm of the friction- I, IRVING A. Hon'rms, a citizen of the United States, residing at reference being One end of each of the brake arms e, e is formed with a slot e" through which passes an end of a stud-bolt g-carried by one of the rocker-arms h, h, one end of which is pivotally mounted and is, therefore, free to rock on one of the stud-shafts d, d and the other end of which is-pivotally connected to one of a, pairof toggle-links 2', 11. The opposed ends of these toggle-links i, i are pivotally fastened to'one end of a linkbar j the other end of which ispivotally con-. nected to an operating-lever or handle-bar one end of which is fulcrumed at l0 to the slide-block m and the other or free end of which is provided with a handle is" and with a stud which normally rests upon the upper edge of the link-bar y'. To the frame of the machine is fastened a bracket n provided with ways n between which is slidably mounted the slide-block m. The latter is formed with a threaded socket 721/ in which engages the threaded end of a shaft 0 on which is keyed the friction-disk p having a grooved hub p. In the upright frame-member or standard a is formed a threaded hole a in which is screwed an ex-. teriorly-threaded bushing q in whichis rotatably mounted a shaft r on one end of which is mounted a friction-disk s and on the other end of which is fastened a gear t. This gear meshes with a pinion u mounted fast upon a shaft 'v'which'is driven'from any suitable source of power and, which may be taken to represent conventionally a driving mechanism.- ;The*shaft 7' may. be'moved lengthwise to adjust the position of the friction-disk s by seizing and turning the head 9- of the bushing q, and the latter may be locked in place by the lock-nut g.

The web w from the roll of material a: breaks over a supporting roll y each end of which is rotatably mounted in the upper end of a plunger 2 the lower end of which extends through an exteriorly-threaded bushing 2 into a hole in the horizontal frame-member a*. The plunger 2 is yieldingly supported on the coil-spring 3.' The web w then passes under a roll 4 one end of pulley c.

of a rocker-arm 5 mounted on the rock-shaft 6. On the latter is also mounteda rockerarm 7 the free lower end of which is provided with a stud 8 which projects into the circumferential groove p" in the hub p of the friction-disk p." To the rocker-arm 7 is which is rotatably mounted in the free end attached one end of a plunger '9 the'otherend of which is free and works in an exl n the standard a and below the roll-holding shaft 6 there is mounted'a stud-shaft 13 which is exteriorly threaded and with the threads of WhlCh engage the threads of an interiorly-threaded sleeve or bushin 14 formed with an outwardlyrojecting ange 15 atone end and to the ot e r end of which is fastened a collar 16. Between the latter and the flange 15 there is mounted on the bushing 14 the hub 17 'of an arm 18 one end of which is formed with a hole through which passes the free end of a spindle or guide-rod 19 mounted in the standard a.

Upon the shaft 6 is fastened a collar 6 between which and the hub of the frictionpulley 0 passes the other end of the arm 18. An inspection of Fig. 4 will clearly show that, when the fast collar 16 is turned, the roll-holding shaft will be moved lengthwise so as to adjust the position of the roll at.

The operation of the mechanism may now be briefly described as follows: When the tension of the web exceeds the allowable tension or normal tension, the rocker-arm 7 will be thrown to the left in Fig. 2 and,

therefore, against theAtension of the coilspring 12. The latter will force the rockerarm 7 to the right in Fig. 2, if the web tension falls below the normal. When the peripheral edge of the friction-disk p is thus carried beyond the central depression 8 in the friction-disk s, the disk will be frictionally driven and will cause the shaft 0 to rotate, whereby the slide-block at will be moved. This movement of the latter will be transmitted to the brake-arms e, 6' through the arm or bar is and the links j, 2', zI,'whereb the pressure of the brake-shoes f on the rim of the friction-pulley will .be varied. It is obvious that the greater the variation of the web tension is from the normal, the faster will the friction-disk p be driven and the more rapidly will the brakearms be moved. By turning the bushing 10 the tension of the coil-spring 12 may be varied. The central depression 8 prevents the operation of the mechanism for slight differences or variations of the tension from v the normal. The pressure of the brake-shoes f for any givenposition of the links 2', z" may be varied or adjusted by changing the positions of the stud-bolts g in the slots 0.

When it is desired to remove the frictionpulley c from between the brake-arms (as in puttinga new roll a: on theshaft b), the

and pulls it operator seizes the handle k upwardly, whereby the upper brake-arm e will be thrown upwardly at its free end. The pull given by the operator will be a sudden pull and he will release the handle k" almost immediately. The brake-arm e will be thrown at its free end past the vertical by reason of its momentum and the link i will lie in a substantially horizontal posi tion or in prolongation of the link-bar 7' after the handle-bar 7c has dropped to its initial position.

The depression 8 in the friction disk .9

permits slight variations in the tension of.

to move in response to variations in the tension of the web; a driving mechanism provided with a friction-disk; and a second friction-disk which contacts therewith and is driven thereby and which is operatively connected with said devices and means and arranged thereby to control said devices to maintain the tension of the web uniform; said means moving the last-named friction disk across the face of the other friction disk.

2. In web-tension controlling mechanism, the combination of devices for placing the web under tension; means mounted free to move in response to variations in the tension of the web; a driving mechanism provided with a friction-disk having a depression in its face; and a second friction-disk which contacts therewith and is driven thereby and which is operatively connected with said devices and means and is arranged thereby to control said devices to maintain the tension of the web uniform; said means moving the last-named friction-disk over said face.

3. In web-tension controlling mechanism, the combination of devices for placing the web under tension; means mounted free to move in response to variations in the tension of the web; a driving mechanism; link mechanism connected with said devices; and devices connected with said link mechanism and controlled by said means and moved by the latter into and out of operative relation to said driving mechanism.

4. .In web-tension controlling mechanism, the combination of devices for placing the web under tension; means mounted free to move in response to variations in the tension of the web; a driving mechanism; link mechanism connected with said devices; a slide-block for actuating said link-mechanism; a threaded shaft which engages and moves said slide-block; and a device which turns said shaft and is controlled by said means and moved by the latter into and out of operative relation to said driving mechanism.

5. A web-tension controller having a rollcarrying shaft from which a web is led; a pair of brake-arms which vary the frictional resistance of said shaft to rotation and thereby the tension of the web; link mechanism connected with said brake-arms; mechanically-driven devices for actuating said link mechanism and brake-arms; means for controlling said mechanicallydriven devices and making the same responsive to variations in the tension on the web; and a manually-operated arm for actuating said link mechanism independently of said mechanically-driven devices and thereby throwing one of said brake-arms away from the other. I

6. In web-tension controlling mechanism, the combination of a roll-carrying shaft from which a web is led; a pair of brakearms; a pair of toggle-links connected with said brake-arms; and an operating arm connected with said toggle-links for throwing one of said brake-arms away from the other.

7 A web-tension controller having a rollcarrying shaft from which a web is led; a pair of brake-arms which vary the frictional resistance of said shaft to rotation and thereby the tension of the web; rocker-arms upon which said brake-arms are adjustably mounted; link mechanism connected with said rocker-arms; mechanically-driven devices for actuating said linkmechanism and brake-arms; means for controlling said mechanically-driven devices and making the same responsive to variations in the tension on the web; and a manually-operated arm for actuating said link mechanism independently of said mechanically-driven devices and thereby throwing said brake-arms away from'the other.

8. In web-tension controlling mechanism, the combination of a pair of brakearms; link-mechanism connected therewith; a manually-operable operating arm for actuating said link-mechanism and thereby throwing one of said brake-arms away from the other; means mounted free to move in response to variation in the tension of the web; a driving mechanism; and devices connected with said operating arm and controlled by said means and moved by the latter into and out of operative relation to said driving mechanism.

9. In web-tension controlling mechanism, the combination of a pair of brake-arms; link mechanism connected therewith; a manually-operable operating arm for actuating manually said link mechanism and thereby throwing one of said brake-arms away from the other; means mounted free to move in response to variations in the tension of the web; and devices connected with said operating arm and controlled by said means for controlling said brake-arms to maintain the tension of the web uniform.

10. In web-tension controlling mechanism, the combination of a pair of brakearms; link mechanism connected therewith; an operating arm for actuating said link mechanism and thereby throwing one of said brake-arms away from the other; means mounted free to move in response to variations in the tension of the web; and devices connected with said operating arm and controlled by said means for controlling said brake-arms to maintain the tension of the web uniform; said arm being susceptible of operation independently of said devices.

In witness whereof I hereunto set my hand this third day of December, 1910, at Plainfield, New Jersey, in the presence of the two undersigned witnesses.

WILLIAM M. STILLMAN, IDA L. Snow. 

